Twisting devices for filaments

ABSTRACT

The device comprises at least one rotary ring against which the filament must be applied so as to be driven in rotation by the inner edge of the rotary ring to undergo twisting. This rotary ring is driven by a single drive roller and the rotary ring comprises an outer edge of magnetic material. It is supported on said single drive roller by a fixed support roller and by a magnetic device inserted between the fixed support roller and the single drive roller.

United States Patent Batsch TWISTING DEVICES FOR FILAMENTS [75]Inventor: Guy Batsch, Aubenas, France [73] Assignee: Societe CivileTextile dite Socitex,

' Lyon, France [22] Filed: Dec. 14, 1972 [2]] Appl. No.: 315,166

[30] Foreign Application Priority Data Jan. 5, 1972 France 72.00168 [52]US. Cl. 57/77.4, 57/77.45 [51] Int. Cl D02g 1/02 [58] Field of Search57/34 R, 77.3-77.45

[5 6] References Cited UNITED STATES PATENTS 3,656,288 4/1972 Gilchrist57/77.4 X 3,345,811 10/1967 Gilchrist 57/77.45

[ Jan. 29, 1974 3,142,953 8/1964 Gassner et al. 57/77.45

FOREIGN PATENTS OR APPLICATIONS 1,285,433 l/l962 France 57/77.4

854,780 11/1960 Great Britain 57/77.4

Primary Examiner-Donald E. Watkins Attorney, Agent, or Firm-Michael S.Striker [5 7] ABSTRACT The device comprises at least one rotary ringagainst which the filament must be applied so as to be driven inrotation by the inner edge of the rotary ring to undergo twisting. Thisrotary ring is driven by a single drive roller and the rotary ringcomprises an outer edge of magnetic material. It is supported on saidsingle drive roller by a fixed support roller and by a magnetic deviceinserted between the fixed support roller and the single drive roller.

8 Claims, 5 Drawing Figures PATENTEU-JAN 29 IQ'W- 3.788.057

sum 1 BF 2 TWISTING DEVICES FOR FILAMENTS BACKGROUND OF THE INVENTIONThe invention relates to twisting devices for filaments (that is to sayfor fine threads) especially for textile filaments. More particularlythe invention relates to such devices comprising a rotary ring againstwhich the filament must be applied so as to be driven in rotation by theinner edge of the rotary ring in order to undergo twisting.

It has already been proposed, in my copending patent application Ser.No. 183,503 filed Sept. 24, 1971, to drive such rotary rings by a singledrive roller against which the rotary ring is kept supported. In thelastmentioned application it was indicated that the rotary rings couldbe held against the single drive when by means of two rollers of whichone was mounted elastically.

SUMMARY OF THE INVENTION It is an object of the present invention toprovide an improvement to replace this support mechanism using tworollers by a mechanism, which enables practically vibration freeoperation.

It is another. object of the invention to provide an improved devicewhich enables very easy changing of the rotary ring and enables rapidadaptation of the type of rotary ring to the nature of the filament tobe processed.

It is yet another object of the present invention to provide an improveddevice in which a single rotary ring may be used.

Other objects and advantages will become apparent from the descriptionwhich follows.

The twisting device according to the invention is characterised by thefact that the rotary ring comprises an outer edge of magnetic material,and by the fact that it is held supported on the single drive roller bya fixed support roller and by a magnetic device arranged between thefixed support roller and the single drive roller, this magnetic devicebeing preferably arranged to draw said rotary'ring against the singledrive roller and the fixed support roller.

The invention consists, apart from this main feature, of certain otherfeatures which are preferably used at the same time and which will bemore explicitly considered below.

DETAILED DESCRIPTION The invention will in any case, be well understoodby means of the detailed description which follows as well as of theaccompanying drawings, which description and drawings relate to apreferred embodiment of the invention and do not of course comprise anylimiting character.

In the drawings:

FIGS. 1 and 2 are partial diagrammatic views of a twisting deviceaccording to the invention shown in an inactive configuration in FIG. 1,and in an active configuration in FIG. 2.

FIGS. 3 and 4 are two end views respectively of the twisting deviceshown in FIG. 1 and of the twisting device shown in FIG. 2. I

FIG. 5, lastly, is a cross-section on a larger scale of an importantelement of the twisting device shown in the preceding FIGS.

In FIGS. 1 to 4, there is shown a twisting device for a textilefilament, this twisting device being inserted between a fixing device 1and a delivery device 2 of a machine for the texturisation of thistextile filament 3.

As indicated in the aforementioned patent application, this twistingdevice can comprise several rotary rings, denoted by the referencenumeral 4 modified by an index a or b as explained below.

These rotary rings are driven in a rotary movement in the same directionand with the same speed, or with different speeds, and the filament 3must be applied against the abovesaid rotary rings so as to be driven inrotation by their inner edge to undergo twisting.

These rotary rings are staggered along a rectilinear path which thefilament follows in the absence of the twisting device, that is to say arectilinear path extending from the delivery device 2 to the fixingdevice 1.

These rotary rings are distributed in two overlapping groups A and B, sothat in following this rectilinear path there is alternately encountereda ring 4a of the group A and a ring 4b of the group B.

These two groups A and B can undergo relative displacement, in adirection perpendicular to the rectilinear path, in order to pass froman inactive configuration for which the rotary rings 4a, 4b of the twogroups A and B surround with play the rectilinear path of the filament 3(FIGS. 1 and 3), to an active configuration, in which the rotary rings4a, 4b of the two groups A and B come into contact with the filament 3and oblige it to follow a sinuous path for which the filament 3 isapplied against said rotary rings 4a, 4b so as to be rotated by theirinner edge to undergo the desired twisting (FIGS. 2 and 4).

The rings 4a 4b of the two groups A and B are held supported on a singledrive roller 5 driving said rings, and the relative displacement of thetwo groups A and B is effected by pivoting around the axis of thissingle drive roller 5; this single drive roller 5 is itself rotated by atangential belt 7.

The two groups A and B are arranged so that when the two groups are ininactive configuration (FIGS. 1 and 3), the rings 4a, 4b of these twogroups A and B are coaxial.

From a mechanical point of view, it is simpler to provide a fixed groupof rings, group A, whilst the other group, the group B, is movable.

As regards the number of rotary rings included-in such a device, it isadvantageous to provide, for the fixed group A, at least two rotaryrings 4a, and for the movable group B, at least one rotary ring 4b.

In FIGS. 1 to 4, there are shown a twisting device which comprises afixed group A with two rotary rings 4a and a movable group B with arotary ring 4b.

Each of the rotary rings 40, 4b comprises an outer edge 50 of magneticmaterial, and it is held supported on the single drive roller 5 by afixed support roller 51 and by a magnetic device 52, such as a permanentmagnet, arranged between the fixed support roller 51 and the singledrive roller 5.

This magnetic device 52 is arranged to attract the' ring 4a, 4bconcerned against the single drive roller 5 and the fixed support roller51.

With respect to a given drive ring 4a, 4b, the angular separation(measured along its smallest value) existing between the fixed supportroller 51 and the single drive roller 5 is less than the magnetic device52 being arranged substantially in the middle of this angularseparation; by way of example, there is shown in FIGS. 3 and 4 atwisting device for which the angular separation between the fixedsupport roller 51 and the single drive roller 5 is 120, the axis of themagnetic device 52 being arranged on the bisector of this angle of 120.

The fixed support rollers 51 and the magnetic devices 52 are then borneby a fixed support 11a, when it relates to holding the two rings 4a ofthe fixed group A, and by a movable support 11b, when it relates toholding the ring 4b of the movable group B.

The movable support 11b is pivotally mounted around the axis of thesingle drive roller 5 and bears a manipulating member 12.

From the constructional point of view and as shown in FIGS. 1 and 4, thesingle drive roller 5 comprises drive discs 8 cooperating respectivelywith the two rings 4a of the fixed group A and with the ring 4b of themovable group B.

To this end, each of the abovesaid rings 4a, 4b comprises a groove 9formed in the outer edge 50 and in which the corresponding drive disc 8becomes positioned.

Considering that the outer edge 50 of each ring 4a, 4b is generallyconstituted by a metallic, hence relatively rigid material, the drivediscs 8 and the fixed support rollers 51 are provided with an outeredge, 53 and 54 respectively, constituted of a flexible materialenabling the rotation of the rotary rings 4a, 4b.

This outer edge 53 and 54, can advantageously be constituted by amaterial such as that known under the trademark VULKOLLAN."

As for the rotary ring 4a, 4b, it comprises on the inside, one orseveral rings 55 with a rounded inner edge and constituted by a flexibleor rigid material enabling the driving of the textile filament 3 (FIG.5).

This or these rings 55 can advantageously be constituted by a materialsuch as that known under the trademark VULKOLLAN. I

Finally, due to this solution of a magnetic device to hold each rotaryring supported against the corresponding drive disc of the single driveroller,

on one hand, the operation of the twisting device is effected withoutany mechanical vibration,

and on the other hand, it is possible to change the rotary rings muchmore easily, in particular to adapt them to the nature of the filamentto be processed, these rotary rings being very accessible since they areno longer wedged between the machanical elements.

-As is self-evident and as emerges already from the foregoing, theinvention is in no way limited to those types of application andembodiments which have been more especially envisaged; it encompasses,on the contrary, all modifications.

I claim:

1. Twisting device for textile filaments, comprising at least one rotaryring against which the filament must be applied so as to be driven inrotation by the inner edge of the rotary ring to undergo twisting, saidrotary ring being driven by a single drive roller, said rotary ringcomprising an outer edge of magnetic material and being held supportedon said single drive roller by a fixed support roller and by a magneticdevice inserted between the fixed support roller and the single driveroller.

2. Device according to claim 1, wherein the magnetic device is arrangedto draw the rotary ring against the single drive roller and the fixedsupport roller.

3. Twisting device for filaments, comprising several rotary ringsagainst which the filament must be applied so as to be rotated by theinner edge of said rotary rings to undergo twisting, these rotary ringsbeing staggered along a rectilinear path and distributed into twooverlapping groups so that in following said rectilinear path there isalternately encountered a ring of one group and a ring of the othergroup, these two groups being able to undergo relative displacement in adirection perpendicular or substantially perpendicular to saidrectilinear path, this relative displacement being effected by pivotingaround the axis of a single drive roller against which the rotary ringsof the two groups are kept supported, each rotary ring comprising anouter edge of magnetic material, and being held supported on the singledrive roller by a fixed support roller and by a magnetic device arrangedbetween the fixed support roller and the single drive roller.

4. Device according to claim 3, wherein the magnetic device is arrangedto draw the rotary ring concerned against the single drive roller andthe fixed support roller.

5. Device according to claim 1, wherein the magnetic device isconstituted by a permanent magnet.

6. Device according to claim 1, wherein the rotary rings form a fixedgroup (A) and a movable group (B) and the single drive roller comprisesdrive discs cooperating respectively with the rotary rings which eachcomprise a groove formed in the outer edge and in which thecorresponding drive disc becomes positioned, the one or more fixedsupport rollers and the one or more magnetic devices being carried by afixed support when it relates to a rotary ring of the fixed group (A)and by a movable support when it relates to a rotary ring of the movablegroup (B).

7. Device according to claim 1, wherein the one or more drive discs andthe one or more fixed support rollers are provided with an outer edgeconstituted of flexible material enabling the driving of the rotaryrings in rotation.

8. Device according to claim 1, wherein each rotary ring comprises onthe inside one or several rings with a rounded inside edge andconstituted of a flexible or rigid material enabling the driving of thefilament.

1. Twisting device for textile filaments, comprising at least one rotaryring against which the filament must be applied so as to be driven inrotation by the inner edge of the rotary ring to undergo twisting, saidrotary ring being driven by a single drive roller, said rotary ringcomprising an outer edge of magnetic material and being held supportedon said single drive roller by a fixed support roller and by a magneticdevice inserted between the fixed support roller and the single driveroller.
 2. Device according to claim 1, wherein the magnetic device isarranged to draw the rotary ring against the single drive roller and thefixed support roller.
 3. Twisting device for filaments, comprisingseveral rotary rings against which the filament must be applied so as tobe rotated by the inner edge of said rotary rings to undergo twisting,these rotary rings being staggered along a rectilinear path anddistributed into two overlapping groups so that in following saidrectilinear path there is alternately encountered a ring of one groupand a ring of the other group, these two groups being able to undergorelative displacement in a direction perpendicular or substantiallyperpendicular to said rectilinear path, this relative displacement beingeffected by pivoting around the axis of a single drive roller againstwhich the rotary rings of the two groups are kept supported, each rotaryring comprising an outer edge of magnetic material, and being heldsupported on the single drive roller by a fixed support roller and by amagnetic device arranged between the fixed support roller and the singledrive roller.
 4. Device according to claim 3, wherein the magneticdevice is arranged to draw the rotary ring concerned against the singledrive roller and the fixed support roller.
 5. Device according to claim1, wherein the magnetic device is constituted by a permanent magnet. 6.Device according to claim 1, wherein the rotary rings form a fixed group(A) and a movable group (B) and the single drive roller comprises drivediscs cooperating respectively with the rotary rings which each comprisea groove formed in the outer edge and in which the corresponding drivedisc becomes positioned, the one or more fixed support rollers and theone or more magnetic devices being carried by a fixed support when itrelates to a rotary ring of the fixed group (A) and by a movable supportwhen it relates to a rotary ring of the movable group (B).
 7. Deviceaccording to claim 1, wherein the one or more drive discs and the one ormore fixed support rollers are provided with an outer edge constitutedof flexible material enabling the driving of the rotary rings inrotation.
 8. Device according to claim 1, wherein each rotary ringcomprises on the inside one or several rings with a rounded inside edgeand constituted of a flexible or rigid material enabling the driving ofthe filament.